Optical fibre cables - Part 1-2: Generic specification - Basic optical cable test procedures - General guidance

IEC 60794-1-2:2021 is available as IEC 60794-1-2:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60794-1-2:2021 applies to optical fibre cables for use with telecommunications equipment and devices employing similar techniques, and to cables having a combination of both optical fibres and electrical conductors. An objective of this document is to define general requirements and methodology guidance applicable to all of the cable test methods of IEC 60794-1 (all parts). A second objective of this document is to provide the end user with an overview of the different test methods contained in the different parts of the IEC 60794-1 series. This fifth edition cancels and replaces the fourth edition published in 2017. This edition constitutes a technical revision. This edition includes the following significant technical change with respect to the previous edition:
- addition of cross-reference tables listing the new test method numbers and the previous test method numbers.

Câbles à fibres optiques - Partie 1-2: Spécification générique - Procédures fondamentales d'essais des câbles optiques - Recommandations générales

IEC 60794-1-2:2021 est disponible sous forme de IEC 60794-1-2:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente .
L'IEC 60794-1-2:2021 s’applique aux câbles à fibres optiques destinés à être utilisés dans les équipements de télécommunications et les dispositifs utilisant des techniques analogues, ainsi qu'aux câbles constitués d'une combinaison de fibres optiques et de conducteurs électriques. L'un des objectifs de cette spécification est de définir des exigences générales et des recommandations méthodologiques applicables à toutes les méthodes d'essai des câbles de l'IEC 60794-1 (toutes les parties). Un second objectif du présent document est de fournir à l'utilisateur final une vue d'ensemble des différentes méthodes d’essai contenues dans les différentes parties de la série IEC 60794-1. Cette cinquième édition annule et remplace la quatrième édition parue en 2017. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- ajout de tableaux de correspondances énonçant les nouveaux numéros de méthodes d'essai et les anciens numéros de méthodes d'essai.

General Information

Status
Published
Publication Date
14-Jan-2021
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
15-Jan-2021
Ref Project

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IEC 60794-1-2
Edition 5.0 2021-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 1-2: Generic specification – Basic optical cable test procedures – General
guidance
Câbles à fibres optiques –
Partie 1-2: Spécification générique – Procédures fondamentales d'essais des
câbles optiques – Recommandations générales
IEC 60794-1-2:2021-01(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60794-1-2
Edition 5.0 2021-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibre cables –
Part 1-2: Generic specification – Basic optical cable test procedures – General
guidance
Câbles à fibres optiques –
Partie 1-2: Spécification générique – Procédures fondamentales d'essais des
câbles optiques – Recommandations générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-9248-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60794-1-2:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

4 General guidance ............................................................................................................ 7

4.1 Test procedure format ............................................................................................. 7

4.2 Standard atmospheric conditions ............................................................................ 7

4.3 Symbols and abbreviated terms .............................................................................. 8

4.4 Safety and environmental aspects........................................................................... 8

4.5 Calibration .............................................................................................................. 8

4.5.1 Calibration process .......................................................................................... 8

4.5.2 Assessment of uncertainties ............................................................................ 8

4.6 Preconditioning ....................................................................................................... 9

4.7 Guide to qualification sampling ............................................................................... 9

4.8 Optical launch conditions ........................................................................................ 9

4.9 Standard optical test wavelengths ........................................................................... 9

Annex A (informative) Cross-references between new and old test method numbers ........... 10

Bibliography .......................................................................................................................... 16

Table 1 – Document overview ................................................................................................. 6

Table 2 – Standard optical test wavelengths ........................................................................... 9

Table 3 – Alternative optical test wavelengths ......................................................................... 9

Table A.1 – IEC 60794-1-1xx series ...................................................................................... 10

Table A.2 – IEC 60794-1-2xx series ...................................................................................... 11

Table A.3 – IEC 60794-1-3xx series ...................................................................................... 12

Table A.4 – IEC 60794-1-4xx series ...................................................................................... 12

Table A.5 – IEC 60794-1-21 method numbers ....................................................................... 12

Table A.6 – IEC 60794-1-22 method numbers ....................................................................... 14

Table A.7 – IEC 60794-1-23 method numbers ....................................................................... 14

Table A.8 – IEC 60794-1-24 method numbers ....................................................................... 15

---------------------- Page: 4 ----------------------
IEC 60794-1-2:2021 © IEC 2021 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 1-2: Generic specification –
Basic optical cable test procedures –
General guidance
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

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6) All users should ensure that they have the latest edition of this publication.

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60794-1-2 has been prepared by subcommittee 86A: Fibres and

cables, of IEC technical committee 86: Fibre optics.

This fifth edition cancels and replaces the fourth edition published in 2017. This edition

constitutes an technical revision.

This edition includes the following significant technical change with respect to the previous

edition:

a) addition of cross-reference tables listing the new test method numbers and the previous test

method numbers.
---------------------- Page: 5 ----------------------
– 4 – IEC 60794-1-2:2021 © IEC 2021
The text of this International Standard is based on the following documents:
CDV Report on voting
86A/2009/CDV 86A/2057/RVC

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.
This International Standard is to be used in conjunction with IEC 60794-1-1.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 60794 series, published under the general title Optical fibre cables,

can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to

the specific publication. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 60794-1-2:2021 © IEC 2021 – 5 –
INTRODUCTION

A decision has been reached to reorganize the IEC 60794-1-2 set of test methods into single-

subject documents. This will be a migration as the existing test methods are revised and as new

test methods are promulgated, rather than a wholesale rewrite. Part of this migration is a

decision to maintain the traditional letter-number classification and to use a numbering system

which maintains connection to the existing numbering system.

The new test method numbering format has been agreed, in line with IEC Secretariat guidelines,

to help the cross-referencing from old to new and that will make the updating of the relevant

sectional and product specifications easier. Cross-reference tables listing the new test method

numbers and the previous test method numbers have been included (see Annex A, Table A.1

to Table A.8).
The format agreed is as follows:
IEC 60794-1-Xnn
where
X = 2 digit of the old 2-digit reference;
nn = incremental number (starting with old test method number).
For example:
IEC 60794-1-21 method E1 (tensile) becomes IEC 60794-1-101;
IEC 60794-1-22 method F5 (water penetration) becomes IEC 60794-1-205;
IEC 60794-1-23 method G7 (tube kinking) becomes IEC 60794-1-307;
IEC 60794-1-24 method H2 (lightning) becomes IEC 60794-1-402.

Annex A has been added to this document containing a cross-reference between the old and

new number scheme.
---------------------- Page: 7 ----------------------
– 6 – IEC 60794-1-2:2021 © IEC 2021
OPTICAL FIBRE CABLES –
Part 1-2: Generic specification –
Basic optical cable test procedures –
General guidance
1 Scope

This part of IEC 60794-1 applies to optical fibre cables for use with telecommunications

equipment and devices employing similar techniques, and to cables having a combination of

both optical fibres and electrical conductors.

An objective of this document is to define general requirements and methodology guidance

applicable to all of the cable test methods of IEC 60794-1 (all parts).

A second objective of this document is to provide the end user with an overview of the different

test methods contained in the different parts of the IEC 60794-1 series, numbered -Xnn.

Table 1 shows the different parts.
Table 1 – Document overview
Test methods IEC reference Previous Test method category
compendium reference letter
reference
General guidance IEC 60794-1-2 IEC 60794-1-2 -
Mechanical IEC 60794-1-1nn IEC 60794-1-21:2015 Methods E
Environmental IEC 60794-1-2nn IEC 60794-1-22:2017 Methods F
Cable elements IEC 60794-1-3nn IEC 60794-1-23:2019 Methods G
Electrical IEC 60794-1-4nn IEC 60794-1-24:2014 Methods H

NOTE 1 The compendium reference specifications detailed in column 3 will continue in force until all of the test

methods therein are revised into the single-subject documents using the new numbering scheme.

NOTE 2 For existing test methods, "nn" is the test method number. For new test methods, "nn" is an incremental

number following the last test method number for that test category.

NOTE 3 Several numbers in the test method numbering sequence are missing. The reasons for these omissions

are historical. To avoid confusion, the existing numbering sequence has been retained.

These documents define test procedures to be used in establishing uniform requirements for

the geometrical, transmission, material, mechanical, ageing (environmental exposure) and

climatic properties of optical fibre cables, and electrical requirements where appropriate.

Throughout the documents, the wording "optical cable" can also include optical fibre units,

microduct fibre units, etc.

The secondary objective of this document is to provide the end user with useful guidance when

testing optical fibre cables.
---------------------- Page: 8 ----------------------
IEC 60794-1-2:2021 © IEC 2021 – 7 –
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.
IEC 60793-1-40, Optical fibres – Part 1-40: Attenuation measurement methods

IEC 60793-1-46, Optical fibres – Part 1-46: Measurement methods and test procedures –

Monitoring of changes in optical transmittance

IEC 60793-2-40, Optical fibres – Part 2-40: Product specifications – Sectional specification for

category A4 multimode fibres
IEC 60794-1-1, Optical fibre cables – Generic specification – General

IEC 60794-1-21:2015, Optical fibre cables – Part 1-21: Generic specification – Basic optical

cable test procedures – Mechanical tests methods

IEC 60794-1-22:2017, Optical fibre cables – Part 1-22: Generic specification – Basic optical

cable test procedures – Environmental test methods

IEC 60794-1-23:2019, Optical fibre cables – Part 1-23: Generic specification – Basic optical

cable test procedures – Cable element test methods

IEC 60794-1-24:2014, Optical fibre cables – Part 1-24: Generic specification – Basic optical

cable test procedures – Electrical test methods
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60794-1-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 General guidance
4.1 Test procedure format

The standard descriptive order of each test method is in general as follows: object, sample,

apparatus, procedure, requirement, details to be specified, details to be reported. Additional

clauses may be inserted, whilst maintaining this general order.
4.2 Standard atmospheric conditions

Two sets of allowable ambient conditions for cable testing are defined for use in testing in this

document:
a) Standard test conditions
– temperature: +23 °C ± 5 ºC
– pressure: site ambient
---------------------- Page: 9 ----------------------
– 8 – IEC 60794-1-2:2021 © IEC 2021
– relative humidity: 20 % to 70 %
b) Expanded test conditions
– temperature: +25 °C ± 15 ºC
– pressure: site ambient
– relative humidity: 5 % to 95 %

Unless otherwise stated in the particular test, the expanded test conditions shall be used as the

default atmospheric conditions when performing tests. The standard test conditions are only for

use when specifically requested.

NOTE A tightly-controlled temperature range is considered unnecessary for most cable tests.

Consideration shall be given to the effects of temperature differences and variations on

electronic and optical test equipment that may be used in performing the tests. It may be

necessary to maintain such equipment at the controlled atmospheric conditions by appropriate

means.
4.3 Symbols and abbreviated terms
Symbols and abbreviated terms are given in IEC 60794-1-1.
4.4 Safety and environmental aspects
All applicable safety and environmental regulations shall be met.
4.5 Calibration
4.5.1 Calibration process

Ensure the apparatus is calibrated and adjusted in accordance with the manufacturer’s

instructions before use in order to minimize measurement uncertainty.

Record relevant information of the calibration process, such as the calibrated value and

uncertainty of the reference material or test equipment used.
4.5.2 Assessment of uncertainties

Measurement uncertainty may be defined as the range within which the true value of a

measured quantity (the measure) is estimated to lie, within a given likelihood (or confidence

level) [1] . The measurement uncertainty normally comprises several components, some of

which may be estimated using statistical techniques (known as type A uncertainties) whilst

others may be estimated on the basis of experience or other information (known as type B

uncertainties). Components of uncertainty, or variance, are additive, and a confidence interval

may be calculated for the measurements based on the sum of the variance components.

A typical build-up of uncertainty may include the following sources of uncertainty:

– calibration uncertainty of reference materials or equipment used – normally stated on the

calibration certificates of the standards;

– transfer uncertainty – estimated changes in the certified values of reference materials or

equipment since they were calibrated;

– operational uncertainty – estimated effects of environmental conditions, such as temper-

ature and humidity;
___________
Numbers in square brackets refer to the Bibliography.
---------------------- Page: 10 ----------------------
IEC 60794-1-2:2021 © IEC 2021 – 9 –

– statistical (random) uncertainty in the measurement of the specimen and the calibration

standard – due to, for example, electrical noise, vibration, data quantization, etc.

4.6 Preconditioning

Most tests are performed at ambient conditions or begin at ambient conditions, in accordance

with 4.2. The intent is that the preconditioning achieve thermal stability. Some test methods

address thermal stability in an explicit and detailed manner. Unless otherwise specified,

samples shall be preconditioned at ambient conditions for a minimum of 12 h prior to the test.

4.7 Guide to qualification sampling

For qualification purposes, it should only be necessary to test a subset of the fibre and/or

element counts that represent a product range. Not all fibres within a cable are required to be

tested to qualify a cable. A guide to qualification sampling is found in IEC 60794-1-1. Not all

tests are required for a cable design. It depends upon the application and relevant specification.

4.8 Optical launch conditions

Optical measurements shall follow conditions as described in IEC 60793-1-40 for attenuation

and IEC 60793-1-46 for monitoring changes in optical transmittance by transmitted power or

backscattering.
4.9 Standard optical test wavelengths

The standard optical test wavelengths for type testing of cabled optical fibre, performed in

accordance IEC 60794-1-1, are as given in Table 2, unless otherwise specified in the individual

test or in the detail specification.
Table 2 – Standard optical test wavelengths
Fibre type Wavelength
Single-mode 1 550 nm ± 10 nm
Multimode 1 300 nm ± 20 nm
NOTE Other test wavelengths can require different tolerance ranges.

Single-mode fibres which are specified for performance in the L band are tested at 1 625 nm,

as given in Table 3. In this case, specific performance criteria shall be specified at 1 625 nm by

the relevant specification.

For multimode fibres that are optimized for wavelengths lower than 1 300 nm (e.g. 850 nm, as

given in Table 3), the highest specified wavelength shall be tested. In this case, the 1 300 nm

test criteria specified in the relevant specification shall be used. Category A4 multimode fibres

shall be tested at the applicable sub-category wavelength given in IEC 60793-2-40.

Table 3 – Alternative optical test wavelengths
Fibre type Wavelength
Single-mode 1 625 nm ± 10 nm
Multimode 850 nm ± 20 nm
NOTE Other test wavelengths can require different tolerance ranges.

Specified changes in optical performance include an allowance for measurement repeatability.

---------------------- Page: 11 ----------------------
– 10 – IEC 60794-1-2:2021 © IEC 2021
Annex A
(informative)
Cross-references between new and old test method numbers

Table A.1 to Table A.8 show the cross-references between new and old test method numbers.

Table A.1 – IEC 60794-1-1xx series
New IEC 60794-1-1xx IEC 60794-1-21 method
Title
series number number
IEC 60794-1-101 Tensile performance Method E1
IEC 60794-1-102 Abrasion Method E2
Method A: Abrasion resistance of optical fibre cable Method E2A
sheaths
Method B: Abrasion resistance of optical fibre cable Method E2B
markings
IEC 60794-1-103 Crush Method E3
Method A: Plate/plate Method E3A
Method B: Mandrel/plate Method E3B
IEC 60794-1-104 Impact Method E4
IEC 60794-1-105 Stripping force stability of cabled optical fibres Method E5A
IEC 60794-1-106 Repeated bending Method E6
IEC 60794-1-107 Torsion Method E7
IEC 60794-1-108 Flexing Method E8
- Snatch (deleted) Method E9
IEC 60794-1-110 Kink Method E10
IEC 60794-1-111 Bend Method E11
Method A: Standard test procedure Method E11A
Method B: Alternative test procedure Method E11B
- Cut-through resistance (deleted) Method E12
IEC 60794-1-113 Shotgun damage Method E13
Method A: Shotgun test Method E13A
Method B: Shotgun simulation Method E13B
- [Title unknown] (deleted) Method E16
IEC 60794-1-117 Bending stiffness Method E17
Method A: Three-point bend Method E17A
Method B: Cantilever bend Method E17B
Method C: Buckling bend Method E17C
IEC 60794-1-118 Bending under tension Method E18A
IEC 60794-1-119 Aeolian vibration Method E19
IEC 60794-1-120 Cable coiling performance Method E20

IEC 60794-1-121 Sheath pull-off force for optical fibre cable for use in Method E21

patch cords
IEC 60794-1-122 Buffered fibre movement under compression in optical Method E22
fibre cables for use in patch cords
IEC 60794-1-123 Microduct route verification test Method E23
IEC 60794-1-124 Installation test for microduct cabling Method E24
---------------------- Page: 12 ----------------------
IEC 60794-1-2:2021 © IEC 2021 – 11 –
New IEC 60794-1-1xx Title IEC 60794-1-21 method
series number number
IEC 60794-1-125 Rip cord functional test Method E25
IEC 60794-1-126 Galloping Method E26
IEC 60794-1-127 Indoor simulated installation test Method E27
IEC 60794-1-128 Cable and fibre mechanical reliability test Method E28
IEC 60794-1-129 Straight midspan access to optical elements Method E29
IEC 60794-1-130 Coefficient of friction between cables Method E30
IEC 60794-1-131 Microduct inner clearance test Method E31
IEC 60794-1-132 Creep behaviour tension test (for ADSS) Method E32
IEC 60794-1-133 Multiple cable coiling and uncoiling performance Method E33
IEC 60794-1-134 Coefficient of dynamic friction between cables Method E34
IEC 60794-1-135 Sheave test (primarily for OPGW and OPAC) Method E18B
Table A.2 – IEC 60794-1-2xx series
New IEC 60794-1-2xx Title IEC 60794-1-22 method
series number number
60794-1-201 Temperature cycling Method F1
- Deleted Method F2
- Deleted Method F3
- Deleted Method F4
60794-1-205 Water penetration Method F5
Method A: Water penetration (circumferential) Method F5A
Method B: Water penetration (end-on) Method F5B
Method C: Water penetration (end-on, for cables with Method F5C
swellable water blocking material)
- Deleted Method F6
60794-1-207 Nuclear radiation Method F7
60794-1-208 Pneumatic resistance Method F8
60794-1-209 Ageing Method F9
60794-1-210 Underwater cable resistance to hydrostatic pressure Method F10
60794-1-211 S
...

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